However, the insult portion comes in the form of body language when the phrase, "You're Number 1!", is accompanied with raising the dreaded middle finger at the receiver of said compliment.
Results vary as the receiving person could either become angry or amused. But one thing is certain...they will definitely be confused.
Keith: "Yeah man, what can I say? You're Number 1!" (raises middle finger)
Dave: "Hey, thanks...huh? What the hell!?"